US20030164187A1 - Pressure equalizing PV assembly and method - Google Patents
Pressure equalizing PV assembly and method Download PDFInfo
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- US20030164187A1 US20030164187A1 US10/384,513 US38451303A US2003164187A1 US 20030164187 A1 US20030164187 A1 US 20030164187A1 US 38451303 A US38451303 A US 38451303A US 2003164187 A1 US2003164187 A1 US 2003164187A1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S20/00—Supporting structures for PV modules
- H02S20/20—Supporting structures directly fixed to an immovable object
- H02S20/22—Supporting structures directly fixed to an immovable object specially adapted for buildings
- H02S20/23—Supporting structures directly fixed to an immovable object specially adapted for buildings specially adapted for roof structures
- H02S20/24—Supporting structures directly fixed to an immovable object specially adapted for buildings specially adapted for roof structures specially adapted for flat roofs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
- F24S25/10—Arrangement of stationary mountings or supports for solar heat collector modules extending in directions away from a supporting surface
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
- F24S25/60—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules
- F24S25/61—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules for fixing to the ground or to building structures
- F24S25/615—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules for fixing to the ground or to building structures for fixing to protruding parts of buildings, e.g. to corrugations or to standing seams
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
- F24S25/60—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules
- F24S25/65—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules for coupling adjacent supporting elements, e.g. for connecting profiles together
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
- F24S25/60—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules
- F24S25/67—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules for coupling adjacent modules or their peripheral frames
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
- F24S2025/01—Special support components; Methods of use
- F24S2025/02—Ballasting means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
- F24S40/80—Accommodating differential expansion of solar collector elements
- F24S40/85—Arrangements for protecting solar collectors against adverse weather conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S136/00—Batteries: thermoelectric and photoelectric
- Y10S136/291—Applications
Definitions
- the assembly can serve as a protective layer over the roof membrane or support surface, shielding from temperature extremes and ultraviolet radiation.
- Various aspects of the invention are based upon the discovery and recognition that (1) wind uplift forces are spatially distributed, both dynamically and randomly, so that wind uplift forces on a particular PV assembly within an array of PV assemblies changes rapidly in magnitude; and (2) interengaging the various PV assemblies within an array of PV assemblies causes wind uplift forces acting on a single PV assembly to be transferred to other, typically adjacent, PV assemblies.
- a first aspect of the invention is directed to an array of pressure-equalizing photovoltaic (PV) assemblies mountable to a support surface.
- PV photovoltaic
- Each PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base. Vents are formed through the base.
- a pressure equalization path extends from the outer surface of the PV module, past the PV module, to and through at least one of the vents, and to the lower surface of the base. This provides pressure equalization between the outer surface of the PV module and the lower surface of the base to help reduce wind uplift forces on the PV assembly.
- the PV assemblies may be interengaged, such as by interengaging the bases of adjacent PV assemblies.
- the array may also include a deflector and a multi-position deflector support securing the deflector to the base at shipping and inclined-use angles.
- the array maybe circumscribed by a perimeter assembly.
- Cross strapping, extending above, below or through the array, or some combination of above, below and through the array, may be used to secure one perimeter element to a non-adjacent perimeter element.
- a second aspect of the invention is directed to a PV system comprising a support surface and an array of pressure-equalizing photovoltaic (PV) assemblies mounted to the support surface, Each PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base. Vents are formed through the base.
- a pressure equalization path extends from the outer surface of the PV module, past the PV module, to and through at least one of the vents, and to the lower surface of the base. This provides pressure equalization between the outer surface of the PV module and the lower surface of the base to help reduce wind uplift forces on the PV assembly.
- the peripheral edges of adjacent PV assemblies are separated by an average distance of about d.
- a third aspect of the invention is directed to a PV assembly, for use on a support surface.
- Each PV assembly comprises a base, a PV module and a module support assembly securing the PV module to a position overlying the upper surface of the base.
- the PV module is oriented at a first angle to the base by the module support and a deflector is oriented at a second angle to the base by a deflector support. Vents are formed through the base.
- a pressure equalization path extends from the outer surface of the PV module, past the deflector, to through at least one of the vents and to the lower surface of the base. This provides pressure equalization between the outer surface of the PV module and the lower surface of the base to help reduce wind uplift forces on the PV assembly.
- a fourth aspect of the invention is directed to a PV system comprising a support surface, comprising alternating ridges and troughs, and an array of pressure-equalizing photovoltaic (PV) assemblies mounted to the support surface.
- PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base.
- a vent is formed through the base between the center of the PV module and the support assembly.
- a pressure equalization path extends from the outer surface of the PV module, past the PV module, to through the vent and to the lower surface of the base. This provides pressure equalization between the outer surface of the PV module and the lower surface of the base to help reduce wind uplift forces on the PV assembly.
- a fifth aspect of the invention is directed to a method for reducing wind uplift forces on an array of pressure-equalizing photovoltaic (PV) assemblies mountable to a support surface.
- PV pressure-equalizing photovoltaic
- Each PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base.
- the method comprises forming vents through the base and creating a pressure equalization path extending from the outer surface of the PV module, past the PV module, to and through at least one of the vents, and to the lower surface of the base.
- the PV module may be oriented at an angle to the base and a deflector may be mounted at an angle to the base, the module and deflector having portions defining a gap therebetween.
- a sixth aspect of the invention is directed to a method for reducing wind uplift forces on an array of pressure-equalizing photovoltaic (PV) assemblies mountable to a support surface comprising alternating ridges and troughs.
- PV photovoltaic
- Each PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base.
- the method comprises forming vents through the base and creating pressure equalization paths extending from the outer surface of the PV module, past the PV modules, to and through at least one of the vents, and to the lower surface of the base.
- vents in the base of the PV assembly provides for pressure equalization to reduce or eliminate wind uplift forces.
- Appropriately positioning the array on the roof of a building also helps to reduce wind uplift forces.
- Reducing wind uplift forces provides several advantages. First, it reduces the necessary weight per unit area of the array. This reduces or eliminates the need for strengthening the support surface to support the weight of the array, thus making retrofit easier and reducing the cost for both retrofit and new construction. Second, it reduces or eliminates the need for the use of roof membrane- (or other support surface-) penetrating fasteners; this helps to maintain the integrity of the membrane. Third, the cost of transporting and installing the assembly is reduced because of its decreased weight.
- PV assemblies are easier to install than assemblies that rely on ballast weight to counteract wind uplift forces.
- using a PV assembly comprising a base permits the PV assembly to help protect the support surface from the effects of sun, wind, rain, etc., and also, when the base comprises thermal insulation, increases the thermal insulation qualities of the support surface.
- the interengagement of the PV assemblies, and the maintenance of the interengagement of the PV assemblies helps to ensure that uplift forces on one PV assembly tends to get transferred to adjacent PV assemblies thereby helping to counteract wind uplift forces.
- FIG. 1 is a simplified top plan view showing an array of PV assemblies mounted to the horizontal roof of a building
- FIG. 2 is a simplified side view illustrating the height of the building of FIG. 1 and the height of a parapet surrounding the roof surface;
- FIG. 3 is a cross-sectional view taken along line 3 - 3 of FIG. 1 with the bottom surface of the base shown spaced apart from the support surface for purposes of illustration;
- FIG. 4 is enlarged view showing the joint between two PV modules of FIG. 3;
- FIG. 5 is an alternative embodiment of the structure shown in FIG. 4;
- FIG. 6 is a top plan view of a portion of the array of PV assemblies of FIG. 1 illustrating the location of vents, formed through the base, and support assemblies, supporting the PV module above the base;
- FIG. 7 is a simplified cross-sectional view taken along line 7 - 7 of FIG. 6;
- FIG. 8 is a view similar to FIG. 6 illustrating an alternative embodiment of the invention in which vent holes are formed at the joint between adjacent bases;
- FIG. 9 is enlarged cross-sectional view taken along line 9 - 9 of FIG. 8;
- FIG. 10 is a side view of an alternative embodiment of the PV assembly of FIG. 3 showing the use of Z-type support assemblies
- FIG. 11 is enlarged view of a portion of the PV assembly of FIG. 10 showing the use of a low-e film between the base and the PV module;
- FIG. 12 shows an alternative embodiment of the structure of FIG. 4 in which interengagement of the bases is accomplished by fastening one base to an adjacent base;
- FIG. 13 shows a further alternative embodiment in which electrically conductive covers of adjacent bases are electrically secured to one another through an electrical ground connection which also acts to secure the adjacent PV assemblies to one another;
- FIG. 14 is a simplified side view of the PV assembly in which the PV module comprises a flexible PV panel mounted to a PV panel stiffener which provides the necessary support of the flexible PV panel;
- FIG. 15 illustrates an alternative embodiment of the perimeter assembly of FIG. 3 in which a ballast element is housed within a perimeter pan;
- FIG. 16 illustrates a further alternative perimeter assembly using a unitary perimeter element fastened to the adjacent PV assembly
- FIG. 17 is a simplified top plan view illustrating the interconnection of perimeter elements circumscribing an array of PV assemblies to create a belt-like perimeter assembly
- FIG. 18 is a further alternative embodiment of a belt-like perimeter assembly showing the use of cross strapping to secure spaced apart perimeter elements to one another;
- FIG. 19 is a cross-sectional view taken along line 19 - 19 of FIG. 18 illustrating the overlapping of adjacent perimeter pans
- FIG. 20 is a cross-sectional view taken along line 20 - 20 of FIG. 18 illustrating the connection of the cross strapping to one perimeter element and the passage of the cross strapping between the PV module and the base;
- FIG. 21 is a simplified side view of an alternative embodiment of the invention in which the PV module is positioned at an angle to the base, the PV assembly includes an angled deflector, and a gap is defined between the upper edges of the PV module and the deflector;
- FIG. 22 is a top plan view of the PV assembly of FIG. 21 illustrating the location of the vents formed through the base;
- FIG. 23 illustrates an alternative to the PV assembly of FIG. 21 in which vent conduits are used between the vents and the gap;
- FIGS. 24 and 25 are top plan and side views of an alternative embodiment of the PV assembly of FIGS. 21 and 22 in which the support assemblies for the PV module and deflector help to define a constricted flow path between the gap and the vent;
- FIGS. 26, 27 and 28 illustrate top, plan and side views of an alternative embodiment of the assembly of FIGS. 24 and 25 in which the support assemblies are multiposition support assemblies which permit positioning the PV module and deflector in the inclined-use configuration of FIG. 27 and the shipping configuration of FIG. 28, FIG. 28 also illustrating use of a shipping block to help support the PV module during shipping and storage;
- FIG. 29 illustrates a portion of a perimeter element, used with the inclined PV assembly of FIGS. 21 and 22, including an end cap extending upwardly from the pan so to at least substantially cover the triangular opening created by the upwardly extending edges of the PV module and deflector;
- FIG. 30 is a side view of the structure of FIG. 29 including a ballast element housed within the pan;
- FIG. 31 illustrates an alternative embodiment of the perimeter assembly of FIG. 30
- FIG. 32 is a simplified top plan view showing an array of PV assemblies mounted to a support surface comprising alternating ridges and troughs;
- FIG. 33 is a simplified cross-sectional view taken along line 33 - 33 of FIG. 32 showing the use of blocking within the troughs between the support surface and the bases of the PV assemblies, which blocking may be thermally insulating;
- FIG. 34 is a side elevational view showing the details of a perimeter element used with a PV assembly mounted to a corrugated roof;
- FIG. 35 is an isometric view illustrating a length of the perimeter element of FIG. 34 and showing wind baffles extending into the troughs of the corrugated roof;
- FIG. 36 is similar to FIG. 35 with the curb cover and the wind baffle removed to illustrate the mounting elements
- FIGS. 37 - 39 illustrate structure similar to that of FIGS. 34 - 36 used when the perimeter assembly runs parallel to the corrugations;
- FIG. 40 illustrates the mounting elements of a perimeter assembly used with a standing seam roofing system and showing the use of support foam between the support surface of the roof and the bottom of the base;
- FIG. 41 is a cross-section view of the perimeter assembly of FIG. 40 adjacent a PV assembly.
- FIG. 1 illustrates a PV system 10 comprising an array 12 of PV assemblies 14 mounted to a support surface 16 , the support surface being the horizontal roof of a building 18 .
- Array 12 is surrounded by a perimeter assembly 20 .
- building 18 has a height H and a parapet 22 with a parapet height P.
- PV assemblies 14 are interconnected, as shown in FIG. 3, along their abutting edges. This interconnection is important because of the way wind uplift forces act on the array.
- the magnitude of the wind uplift forces on any particular PV assembly 14 within array 12 changes rapidly over time so that the wind uplift forces on one PV assembly may be much greater or much less than the wind uplift forces on an adjacent PV assembly. Therefore, large uplift forces tending to raise one PV assembly are counteracted because raising the one PV assembly will tend to be resisted by the weight of adjacent PV assemblies.
- wind tunnel testing It has been found through wind tunnel testing that it is possible to determine if array 12 of PV modules 24 is or is not in a desired location on roof 16 of building 18 .
- Wind tunnel testing is carried out using the actual PV modules of interest.
- the collected data can be provided in chart form suitable for use with various roof locations, typically near an edge (an edge position), near two edges (a corner position) or not near an edge (a middle roof position). For example, assuming a parapet height of 40 cm and a building height of 30 meters, the maximum 3-second wind gust speed for a middle roof position may range from 120-140 mph (depending on the wind direction) while for a corner or edge position the maximum 3-second wind gust speed will be about 100 to 110 mph (depending on the wind direction).
- each PV assembly 14 comprises a PV module 24 supported above a base 26 by a support assembly 28 .
- Support assembly 28 comprises spaced-apart support member 29 adhered, or otherwise fastened, to PV module 24 and to base 26 .
- Base 26 comprises a main body 30 , which may be made of thermally insulating foam, such as polystyrene, by DOW Chemical, or Noryl PPO (polyphenylene oxide) by GE Plastics, and a base cover 32 .
- Base cover 32 may serve several functions, including adding strength to base 26 , protecting main body 30 from degradation due to exposure to sunlight, and also permitting adjacent bases to be securely fastened to one another so to keep them from separating and thus losing the benefits of being interengaged.
- Base cover 32 may be an electrically conductive sheet metal cover made of polyvinylidene fluoride (PVDF) resin-coated metal.
- PVDF resin is available from ATOFINA Chemicals, Inc of Philadelphia, Pa. as KYNAR® polyvinylidene fluoride (PVDF) resin.
- base cover 32 could be made of, for example, galvanized steel, steel, zinc-alum, or aluminum.
- Cover 32 may have an electrically insulating surface coat of, for example, PVDF resin, Noryl PPO, ASA 606 Acrylic paint by Colloid Research, Inc., or ceramic filled resin coatings by ICS Technologies or EP21LV epoxy by Master Bond Inc.
- cover 32 may be electrically non-conducting, such as Noryl PPO, ASA 606 Acrylic paint, ceramic filled resin, or other non-conducting material.
- the interengagement of adjacent PV assemblies 14 is through the use of tongue and groove interengagement elements 34 , 36 formed in main body 30 of each base 26 and, alternatively, or in addition, by mechanically fastening covers 32 to one another using fasteners 38 .
- One or more radiant barriers 40 , 42 , 44 shown in dashed lines in FIG. 3, may be used between or against PV module 24 and base 26 .
- the use of radiant barriers, typically low emissivity (low-e) films, is described in more detail in U.S. Pat. No. 6,061,978.
- the use of thermal insulation in conjunction with PV modules is described in the following U.S. Pat. Nos. 5,316,592; 5,505,788; 5,746,839; and 6,148,570.
- vents 46 are formed in base 26 to provide pressure equalization paths 48 extending from the outer surface 50 of PV module 24 , past the peripheral edge 52 of the PV module, to and through vents 46 , and to the lower surface 54 of base 26 .
- FIGS. 3 and 4 there is an exaggerated gap 56 shown between the lower surface 54 of base 26 and support surface 16 .
- the vents 46 include peripheral vents 58 , see FIG.
- Peripheral vents 58 are located between support assembly 28 and the outer edge 66 of base 26 .
- Pressure equalization paths 48 passing through peripheral vents 58 , are unobstructed from peripheral edge 52 to the vents.
- the pressure equalization paths extending through interior vents 60 have partially obstructed path portions from peripheral edge 52 to vents 60 due to the locations of the various support elements 62 , 64 and the positions of vents 60 between the center 61 of PV module 24 and support elements 62 , 64 ; see FIG. 6.
- the inner surface 63 of PV module 24 is separated from the upper surface 65 of base 26 by an average distance of about h.
- Peripheral edges 52 are separated by an average distance of about d.
- the d/h ratio is preferably about 0.1 to 6 and more preferably about 0.5 to 3.
- Distances h and d typically range from about 1.3 cm to 10 cm for h and about 1.3 cm to 7.6 cm for d, but may be greater or lesser than these distances.
- V to P is (1) at least about 0.02 percent and preferably at least about 0.07 percent, and (2) about 0.02 percent to 50 percent, and preferably about 0.05 percent to 5 percent and more preferably about 0.07 percent to 2 percent.
- Forming vents in this manner aids the ability to use a PV assembly 14 having a weight of about 5-25 kg per square meter while avoiding the need to attach PV assembly 14 to support surface 16 .
- the percentage of w to P be about 0.1% to 50% and more preferably about 0.4% to 5%.
- the determination of the percentage of w to P involves balancing the desire to minimize the holes, as they require additional manufacturing steps and degrade the insulating quality of the foam layer, with the desire to maximize the holes to improve resistance to wind uplift. So the final decision as to the percentage of w to P will typically result in the determination of the minimum vent area needed to withstand uplift forces with comfortable safety margin.
- FIG. 5 illustrates an alternative embodiment of a PV assembly 67 in which PV module 24 is mounted directly onto base 68 using an adhesive as the support assembly; other support structures, such as fasteners or clips, or a combination of support structures, could be used as the support assembly.
- Base 68 is similar to base 26 but includes no cover 32 . Also, base 68 only has peripheral vents 58 which lie generally coincident with peripheral edge 52 of PV module 24 .
- FIGS. 8 and 9 illustrate vents 70 formed at the intersecting outer edges 66 of adjacent bases 26 . Such vents 70 are also considered to be generally aligned with or coincident with peripheral edge 52 of PV module 24 .
- FIGS. 10 and 1I 1 illustrate a PV assembly 72 using Z-type supports 74 secured to PV module 24 with an adhesive 76 .
- Z-type supports 74 are preferably integral, one-piece extensions of base cover 32 .
- Supports 74 may also be attached to base cover 32 .
- a low emissivity (low-e) film 78 is situated between cover 32 and PV module 24 .
- FIG. 12 illustrates an alternative method of interengaging adjacent bases 68 using 30 fastener brackets 80 mounted to each base with the brackets secured together by a double-headed fastener 82 , such as a nut and bolt or rivet.
- FIG. 13 illustrates another alternative in which base covers 32 are interengaged and electrically connected by an electrical ground connection 84 between adjacent covers.
- a wide variety of interengagement elements and electrical ground connections, including rigid, flexible and elastic elements, may be used.
- FIG. 14 illustrates supporting a flexible PV panel 86 with a PV panel stiffener 88 to create a self-supporting, generally rigid PV module 89 .
- Perimeter assembly 20 comprises a series of perimeter elements 90 .
- each perimeter element 90 is the same length as one side of a PV assembly 14 .
- Perimeter elements 90 are preferably secured to one another so that perimeter assembly 28 is a belt-like perimeter assembly.
- Perimeter assembly 20 serves several functions including (1) maintaining the spatial integrity of array 12 by helping to prevent PV assemblies 14 from shifting or otherwise moving laterally relative to one another, and (2) deflecting air away from the lateral edges of array 12 . This latter function is aided by configuring perimeter elements 90 with a sloped outer surface 92 and providing perimeter elements 90 with an upper edge 94 which is about equal in elevation to or above outer surface 50 of PV module 24 .
- Perimeter elements typically weigh about 3-52 kg per linear meter, and more preferably about 18-30 kg per linear meter.
- FIG. 15 illustrates an alternative perimeter element 96 comprising a perimeter pan 98 having an outer lip 100 which is joined to a base portion 102 .
- a generally v-shaped coupler 104 extends from base portion 102 and may be fastened to base 26 by a fastener 106 .
- Perimeter element 96 also includes a ballast element 108 , typically made from concrete, stone or other suitably heavy material.
- FIG. 16 illustrates a unitary perimeter element 110 which may be fastened to base 26 by a fastener 112 .
- Perimeter element 110 is preferably a molded or cast material, such as concrete, or plastic. As shown in FIG. 17, perimeter elements 110 may be secured together using ball and socket type of engagement members 114 .
- FIGS. 18 - 20 illustrates a further embodiment of a perimeter assembly using perimeter elements 116 similar to perimeter element 96 with the following differences.
- a cap 118 is used to cover ballast element 120 , the cap defining a sloped outer surface 122 and an upper edge 124 of perimeter element 116 .
- a coupler 126 is a relatively simple L-shaped member and extends from a pan 128 . The pans 128 of adjacent perimeter elements 116 , overlap, as shown in FIGS. 18 and 19, to help increase the structural rigidity between perimeter elements 116 .
- FIGS. 18 and 20 also illustrate the use of cross strapping 130 between perimeter elements 116 on opposite sides of the array 132 of PV assemblies 14 . In this embodiment cross strapping 130 passes between PV module 24 and base 26 .
- Cross strapping 130 helps to maintain the desired shape of perimeter assembly 134 and thus of array 132 of PV assemblies 14 .
- Other cross-strapping arrangements such as triangular, may also be used.
- FIGS. 21 and 22 illustrates an inclined PV assembly 138 comprising a base 140 , an inclined PV module 142 , and an inclined deflector 144 ; the PV module and deflector are mounted at first and second angles 146 , 148 to the base by a pair of dual purpose supports 150 .
- Angle 146 is typically about 5 degrees to 30 degrees while angle 148 is typically about 20 degrees to 70 degrees.
- the opposed upper edges 152 , 154 of module 142 and deflector 144 define a gap 156 overlying a set of vents 158 formed in base 140 .
- Gap 156 is typically about 2-8 cm wide. Edges 152 , 154 are typically about the same distance above base 140 .
- vents 158 While it may be desirable to use additional vents through base 140 at different locations, it has been found through wind tunnel testing that positioning vents 158 to be generally aligned with or coincident with gap 156 and providing substantially unobstructed flow paths between the gap and the vents appears to be effective in substantially reducing wind uplift forces on inclined PV assembly 138 .
- FIG. 23 illustrates an alternative embodiment to the assembly shown in FIGS. 21 and 22 in which an inclined PV assembly 160 uses hollow conduits 162 to fluidly couple gap 156 and vents 158 .
- FIGS. 24 and 25 illustrates a further alternative embodiment of an inclined PV assembly 166 in which the support assembly is split up into a PV module support assembly 168 and a deflector support assembly 170 .
- a deflector 172 is formed by the outer surface of deflector support assembly 170 .
- Support assemblies 168 , 170 are formed of bent sheet metal and define a constrained flow path 174 between a gap 176 and a single, slot-like vent 178 .
- Base 180 is an extended-width base to provide a walkway 182 adjacent to deflector 172 . Within an array, all of the PV assemblies do not need to be designed with an extended-width base to provide a walkway 182 .
- FIGS. 26 and 27 illustrate an inclined PV assembly 186 similar to the embodiment of FIGS. 24 and 25 but using a multiposition PV module support assembly 188 and a multiposition deflector support assembly 190 .
- Support assembly 188 comprises a hinged support 192 at one end of PV module 142 and a strut 194 pivotally mounted near upper edge 152 of module 142 .
- Assembly 188 also includes a clip 196 at the outer end of strut 194 and a complementary clip 198 positioned adjacent to a hollow extension 200 of vent 178 (see FIG. 28).
- the deflector support assembly 190 includes similar support structure. Clips 196 , 198 engage when assembly 186 is in an inclined, in-use configuration of FIG. 27 to maintain the inclined configuration under wind loads.
- FIG. 28 The deflector support assembly 190
- PV module 142 and deflector 144 in a shipping configuration at which PV module 142 and deflector 144 are generally parallel to base 140 so that angles 146 , 148 are generally about 0 degrees or about 180 degrees.
- a shipping block 202 is positioned between PV module 142 and base 140 ; a similar support block may be used between deflector 144 and base 140 .
- Other means for stabilizing and supporting PV module 142 and deflector 144 in either or both of the in-use and shipping configurations may be used.
- strut 194 may be made to be adjustable in length so to vary first angle 146 ; this may require that deflector support assembly 190 be adjustable so to permit adjustment of the second angle 148 .
- FIGS. 29 and 30 illustrate the use of an end cap perimeter element 204 , similar to perimeter element 96 of FIG. 15, including a ballast element 206 .
- coupler element 96 is substantially enlarged to create an end cap coupler 208 sized to at least substantially cover the generally triangular opening created by the upwardly extending edges 210 and 212 of PV module 142 and deflector 144 .
- FIG. 31 illustrates a perimeter element 214 similar to the perimeter element of FIGS. 29 and 30.
- Perimeter element 214 includes a sloped end cap 216 , similar to that shown in FIGS. 19 and 20, and a tongue and groove interengagement region 218 for interengagement with base 140 .
- Perimeter elements 204 , 214 provide end caps for angled PV assemblies; end caps may also be provided separate from the perimeter elements.
- FIG. 32 is a top plan view illustrating an array 220 of PV assemblies 222 .
- the PV assemblies illustrated are conventional assemblies available from PowerLight Corporation of Berkeley, Calif. as PowerGuard® and are similar to PV assemblies 14 of FIG. 3.
- Array 220 is supported by a corrugated roof 224 , having alternating ridges 226 and troughs 228 , and thermally insulating support blocking 230 within troughs 228 .
- Array 220 is surrounded by a perimeter assembly 232 , shown in more detail in FIGS. 34 - 38 .
- Perimeter assembly 232 comprises mounting elements 234 mounted to ridges 226 of roof 224 using conventional corrugated roof fasteners 236 which pass through base 238 of mounting element 234 .
- Mounting element 234 includes an upstanding portion 240 having a support tab 242 at its upper end and a laterally extending securement clip 244 between base 238 and support tab 242 .
- the clip 244 engages the upper surface 246 of the base 248 of PV assembly 222 to help secure PV assembly 222 , and thus array 220 , to roof 224 .
- Base 248 is of conventional construction with upper surface 246 of a cementitious material covering an expanded polystyrene main body 249 .
- An L-shaped wind baffle member 250 is secured to bases 238 of mounting elements 234 and has a series of downwardly extending wind baffles 252 sized and shaped to fill substantial portions of troughs 228 beneath perimeter assembly 232 .
- Perimeter assembly 232 also includes a cover 254 extending between support tabs 242 and bases 238 .
- Cover 254 has a sloped outer surface 256 .
- Perimeter assembly 232 has an upper edge 258 that is generally even with or vertically above the outer surface 260 of the PV module 262 of PV assembly 222 .
- mounting elements 264 are modified from mounting elements 234 to accommodate positioning perimeter assembly 232 along the sides of array 220 that run parallel to troughs 228 .
- the main difference is that base 266 of mounting element 264 is much longer and extends to both sides of upstanding portion 240 .
- FIGS. 40 and 41 illustrate a standing seam roofing system 268 having standing seam or ridge portions 270 and pan or trough portions 272 .
- Trough portions 272 are effectively filled with blocks of thermally insulating support foam 274 to both provide thermal insulation for roofing system 268 and support an array of PV assemblies 222 and a walkway-type of perimeter assembly 276 .
- Perimeter assembly 276 includes a paver 278 made similarly to base 248 to provide a walkway around the array of PV assemblies 222 .
- L-shaped flashing 280 engages the outer peripheral edge 282 of paver 278 and is secured to standing seam portions 270 by brackets 284 , such as available from Hougovens Aluminum Bausysteme GmbH of Koblenz, Germany as Kal-Zip brackets.
- a sloped cover 286 is mounted along the edge 288 of paver 278 to lie adjacent to assemblies 222 . Sloped cover 286 has an upper edge 290 positioned at least about even with or above outer surface 268 of PV module 262 .
- FIGS. 33 - 41 show the use of insulating foam blocking within the troughs of the building surface.
- Other types of material preferably thermally insulating material, can be used, such as polyurethane-based spray foam insulation.
- vents are formed through base 26 to create one or more pressure equalization paths 48 extending from outer surface 50 of PV module 24 , past peripheral edge 52 , to and through at least one of the vents, and to lower surface 54 of the base. At least some of vents 46 may be positioned to be generally aligned or coincident with peripheral edge 52 . Pressure equalization path 48 may be created so that the portion of the path extending from peripheral edge 52 to a vent 46 is an unobstructed path portion. See, for example, FIGS. 4, 9, 21 and 24 . As shown in FIGS.
- PV module 142 may be oriented at an angle 146 to the base 140 and a deflector 144 may be mounted at an angle 148 to the base, the module and deflector having upper edges 152 , 154 defining a gap 156 therebetween.
- At least one hollow conduit 162 may be used to fluidly couple gap 156 and vent 158 .
- An array of the PV assemblies is mounted to a support surface, typically a horizontal roof; sloped support surfaces may also be used. Mounting typically can be accomplished without the need for fasteners to attach to PV assemblies to the support surface even though the weight of the PV assemblies is in the range of about 10 kg per square meter to 40 kg per square meter and preferably in the range of about 15 kg per square meter to 25 kg per square meter.
- the mounting procedure varies somewhat when an array of PV assemblies is mounted to a support surface comprising alternating ridges and troughs.
- the troughs beneath the perimeter of the array of PV assemblies will typically be filled with wind deflectors.
- Thermal insulation is preferably placed in the troughs beneath the array for thermal insulation and to help support the array; however, the location of the thermal insulation may be limited to the perimeter portions of the array, such as the first meter in from all edges.
- At least one of the vents may be positioned at a location between the center of the PV module and the support assembly for each of a plurality of the PV modules.
Abstract
Description
- This is a continuation of U.S. patent application Ser. No. 09/902,493 filed Jun. 10, 2001 and entitled Pressure-Equalizing Photovoltaic Assembly and Method.
- [0002] The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of PVMat Subcontract ZAX-8-17647-12 awarded by the Department of Energy.
- Air moving across an array of photovoltaic (PV) assemblies mounted to the roof of a building, or other support surface, creates wind uplift forces on the PV assemblies. Much work has been done in the design and evaluation of arrays of PV assemblies to minimize wind uplift forces. See U.S. Pat. Nos. 5,316,592; 5,505,788; 5,746,839; 6,061,978; and 6,148,570. Reducing wind uplift forces provides several advantages. First, it reduces the necessary weight per unit area of the array. This reduces or eliminates the need for strengthening the support surface to support the weight of the array, thus making retrofit easier and reducing the cost for both retrofit and new construction. Second, it reduces or eliminates the need for the use of roof membrane- (or other support surface-) penetrating fasteners; this helps to maintain the integrity of the membrane. Third, the cost of transporting and installing the assembly is reduced because of its decreased weight. Fourth, lightweight PV assemblies are easier to install than assemblies that rely on ballast weight to counteract wind uplift forces. Fifth, when designed properly, the assembly can serve as a protective layer over the roof membrane or support surface, shielding from temperature extremes and ultraviolet radiation.
- Various aspects of the invention are based upon the discovery and recognition that (1) wind uplift forces are spatially distributed, both dynamically and randomly, so that wind uplift forces on a particular PV assembly within an array of PV assemblies changes rapidly in magnitude; and (2) interengaging the various PV assemblies within an array of PV assemblies causes wind uplift forces acting on a single PV assembly to be transferred to other, typically adjacent, PV assemblies.
- A first aspect of the invention is directed to an array of pressure-equalizing photovoltaic (PV) assemblies mountable to a support surface. Each PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base. Vents are formed through the base. A pressure equalization path extends from the outer surface of the PV module, past the PV module, to and through at least one of the vents, and to the lower surface of the base. This provides pressure equalization between the outer surface of the PV module and the lower surface of the base to help reduce wind uplift forces on the PV assembly. The PV assemblies may be interengaged, such as by interengaging the bases of adjacent PV assemblies. The array may also include a deflector and a multi-position deflector support securing the deflector to the base at shipping and inclined-use angles. The array maybe circumscribed by a perimeter assembly. Cross strapping, extending above, below or through the array, or some combination of above, below and through the array, may be used to secure one perimeter element to a non-adjacent perimeter element.
- A second aspect of the invention is directed to a PV system comprising a support surface and an array of pressure-equalizing photovoltaic (PV) assemblies mounted to the support surface, Each PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base. Vents are formed through the base. A pressure equalization path extends from the outer surface of the PV module, past the PV module, to and through at least one of the vents, and to the lower surface of the base. This provides pressure equalization between the outer surface of the PV module and the lower surface of the base to help reduce wind uplift forces on the PV assembly. The peripheral edges of adjacent PV assemblies are separated by an average distance of about d.
- A third aspect of the invention is directed to a PV assembly, for use on a support surface. Each PV assembly comprises a base, a PV module and a module support assembly securing the PV module to a position overlying the upper surface of the base. The PV module is oriented at a first angle to the base by the module support and a deflector is oriented at a second angle to the base by a deflector support. Vents are formed through the base. A pressure equalization path extends from the outer surface of the PV module, past the deflector, to through at least one of the vents and to the lower surface of the base. This provides pressure equalization between the outer surface of the PV module and the lower surface of the base to help reduce wind uplift forces on the PV assembly.
- A fourth aspect of the invention is directed to a PV system comprising a support surface, comprising alternating ridges and troughs, and an array of pressure-equalizing photovoltaic (PV) assemblies mounted to the support surface. Each PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base. A vent is formed through the base between the center of the PV module and the support assembly. A pressure equalization path extends from the outer surface of the PV module, past the PV module, to through the vent and to the lower surface of the base. This provides pressure equalization between the outer surface of the PV module and the lower surface of the base to help reduce wind uplift forces on the PV assembly.
- A fifth aspect of the invention is directed to a method for reducing wind uplift forces on an array of pressure-equalizing photovoltaic (PV) assemblies mountable to a support surface. Each PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base. The method comprises forming vents through the base and creating a pressure equalization path extending from the outer surface of the PV module, past the PV module, to and through at least one of the vents, and to the lower surface of the base. The PV module may be oriented at an angle to the base and a deflector may be mounted at an angle to the base, the module and deflector having portions defining a gap therebetween.
- A sixth aspect of the invention is directed to a method for reducing wind uplift forces on an array of pressure-equalizing photovoltaic (PV) assemblies mountable to a support surface comprising alternating ridges and troughs. Each PV assembly comprises a base, a PV module and a support assembly securing the PV module to a position overlying the upper surface of the base. The method comprises forming vents through the base and creating pressure equalization paths extending from the outer surface of the PV module, past the PV modules, to and through at least one of the vents, and to the lower surface of the base.
- The provision of the vents in the base of the PV assembly provides for pressure equalization to reduce or eliminate wind uplift forces. Appropriately positioning the array on the roof of a building also helps to reduce wind uplift forces. Reducing wind uplift forces provides several advantages. First, it reduces the necessary weight per unit area of the array. This reduces or eliminates the need for strengthening the support surface to support the weight of the array, thus making retrofit easier and reducing the cost for both retrofit and new construction. Second, it reduces or eliminates the need for the use of roof membrane- (or other support surface-) penetrating fasteners; this helps to maintain the integrity of the membrane. Third, the cost of transporting and installing the assembly is reduced because of its decreased weight. Fourth, lightweight PV assemblies are easier to install than assemblies that rely on ballast weight to counteract wind uplift forces. In addition, using a PV assembly comprising a base permits the PV assembly to help protect the support surface from the effects of sun, wind, rain, etc., and also, when the base comprises thermal insulation, increases the thermal insulation qualities of the support surface. Further, the interengagement of the PV assemblies, and the maintenance of the interengagement of the PV assemblies, helps to ensure that uplift forces on one PV assembly tends to get transferred to adjacent PV assemblies thereby helping to counteract wind uplift forces.
- Other features and advantages of the invention will appear from the following description in which the preferred embodiments have been set forth in detail in conjunction with the accompanying drawings.
- FIG. 1 is a simplified top plan view showing an array of PV assemblies mounted to the horizontal roof of a building;
- FIG. 2 is a simplified side view illustrating the height of the building of FIG. 1 and the height of a parapet surrounding the roof surface;
- FIG. 3 is a cross-sectional view taken along line3-3 of FIG. 1 with the bottom surface of the base shown spaced apart from the support surface for purposes of illustration;
- FIG. 4 is enlarged view showing the joint between two PV modules of FIG. 3;
- FIG. 5 is an alternative embodiment of the structure shown in FIG. 4;
- FIG. 6 is a top plan view of a portion of the array of PV assemblies of FIG. 1 illustrating the location of vents, formed through the base, and support assemblies, supporting the PV module above the base;
- FIG. 7 is a simplified cross-sectional view taken along line7-7 of FIG. 6;
- FIG. 8 is a view similar to FIG. 6 illustrating an alternative embodiment of the invention in which vent holes are formed at the joint between adjacent bases;
- FIG. 9 is enlarged cross-sectional view taken along line9-9 of FIG. 8;
- FIG. 10 is a side view of an alternative embodiment of the PV assembly of FIG. 3 showing the use of Z-type support assemblies;
- FIG. 11 is enlarged view of a portion of the PV assembly of FIG. 10 showing the use of a low-e film between the base and the PV module;
- FIG. 12 shows an alternative embodiment of the structure of FIG. 4 in which interengagement of the bases is accomplished by fastening one base to an adjacent base;
- FIG. 13 shows a further alternative embodiment in which electrically conductive covers of adjacent bases are electrically secured to one another through an electrical ground connection which also acts to secure the adjacent PV assemblies to one another;
- FIG. 14 is a simplified side view of the PV assembly in which the PV module comprises a flexible PV panel mounted to a PV panel stiffener which provides the necessary support of the flexible PV panel;
- FIG. 15 illustrates an alternative embodiment of the perimeter assembly of FIG. 3 in which a ballast element is housed within a perimeter pan;
- FIG. 16 illustrates a further alternative perimeter assembly using a unitary perimeter element fastened to the adjacent PV assembly;
- FIG. 17 is a simplified top plan view illustrating the interconnection of perimeter elements circumscribing an array of PV assemblies to create a belt-like perimeter assembly;
- FIG. 18 is a further alternative embodiment of a belt-like perimeter assembly showing the use of cross strapping to secure spaced apart perimeter elements to one another;
- FIG. 19 is a cross-sectional view taken along line19-19 of FIG. 18 illustrating the overlapping of adjacent perimeter pans;
- FIG. 20 is a cross-sectional view taken along line20-20 of FIG. 18 illustrating the connection of the cross strapping to one perimeter element and the passage of the cross strapping between the PV module and the base;
- FIG. 21 is a simplified side view of an alternative embodiment of the invention in which the PV module is positioned at an angle to the base, the PV assembly includes an angled deflector, and a gap is defined between the upper edges of the PV module and the deflector;
- FIG. 22 is a top plan view of the PV assembly of FIG. 21 illustrating the location of the vents formed through the base;
- FIG. 23 illustrates an alternative to the PV assembly of FIG. 21 in which vent conduits are used between the vents and the gap;
- FIGS. 24 and 25 are top plan and side views of an alternative embodiment of the PV assembly of FIGS. 21 and 22 in which the support assemblies for the PV module and deflector help to define a constricted flow path between the gap and the vent;
- FIGS. 26, 27 and28 illustrate top, plan and side views of an alternative embodiment of the assembly of FIGS. 24 and 25 in which the support assemblies are multiposition support assemblies which permit positioning the PV module and deflector in the inclined-use configuration of FIG. 27 and the shipping configuration of FIG. 28, FIG. 28 also illustrating use of a shipping block to help support the PV module during shipping and storage;
- FIG. 29 illustrates a portion of a perimeter element, used with the inclined PV assembly of FIGS. 21 and 22, including an end cap extending upwardly from the pan so to at least substantially cover the triangular opening created by the upwardly extending edges of the PV module and deflector;
- FIG. 30 is a side view of the structure of FIG. 29 including a ballast element housed within the pan;
- FIG. 31 illustrates an alternative embodiment of the perimeter assembly of FIG. 30;
- FIG. 32 is a simplified top plan view showing an array of PV assemblies mounted to a support surface comprising alternating ridges and troughs;
- FIG. 33 is a simplified cross-sectional view taken along line33-33 of FIG. 32 showing the use of blocking within the troughs between the support surface and the bases of the PV assemblies, which blocking may be thermally insulating;
- FIG. 34 is a side elevational view showing the details of a perimeter element used with a PV assembly mounted to a corrugated roof;
- FIG. 35 is an isometric view illustrating a length of the perimeter element of FIG. 34 and showing wind baffles extending into the troughs of the corrugated roof;
- FIG. 36 is similar to FIG. 35 with the curb cover and the wind baffle removed to illustrate the mounting elements;
- FIGS.37-39 illustrate structure similar to that of FIGS. 34-36 used when the perimeter assembly runs parallel to the corrugations;
- FIG. 40 illustrates the mounting elements of a perimeter assembly used with a standing seam roofing system and showing the use of support foam between the support surface of the roof and the bottom of the base; and
- FIG. 41 is a cross-section view of the perimeter assembly of FIG. 40 adjacent a PV assembly.
- FIG. 1 illustrates a
PV system 10 comprising anarray 12 ofPV assemblies 14 mounted to asupport surface 16, the support surface being the horizontal roof of abuilding 18.Array 12 is surrounded by aperimeter assembly 20. As shown in FIG. 2, building 18 has a height H and a parapet 22 with a parapet heightP. PV assemblies 14 are interconnected, as shown in FIG. 3, along their abutting edges. This interconnection is important because of the way wind uplift forces act on the array. The magnitude of the wind uplift forces on anyparticular PV assembly 14 withinarray 12 changes rapidly over time so that the wind uplift forces on one PV assembly may be much greater or much less than the wind uplift forces on an adjacent PV assembly. Therefore, large uplift forces tending to raise one PV assembly are counteracted because raising the one PV assembly will tend to be resisted by the weight of adjacent PV assemblies. - It has been found through wind tunnel testing that it is possible to determine if
array 12 ofPV modules 24 is or is not in a desired location onroof 16 ofbuilding 18. Wind tunnel testing is carried out using the actual PV modules of interest. The collected data can be provided in chart form suitable for use with various roof locations, typically near an edge (an edge position), near two edges (a corner position) or not near an edge (a middle roof position). For example, assuming a parapet height of 40 cm and a building height of 30 meters, the maximum 3-second wind gust speed for a middle roof position may range from 120-140 mph (depending on the wind direction) while for a corner or edge position the maximum 3-second wind gust speed will be about 100 to 110 mph (depending on the wind direction). - As shown in FIGS. 3 and 4, each
PV assembly 14 comprises aPV module 24 supported above abase 26 by asupport assembly 28.Support assembly 28 comprises spaced-apartsupport member 29 adhered, or otherwise fastened, toPV module 24 and tobase 26.Base 26 comprises amain body 30, which may be made of thermally insulating foam, such as polystyrene, by DOW Chemical, or Noryl PPO (polyphenylene oxide) by GE Plastics, and abase cover 32.Base cover 32 may serve several functions, including adding strength tobase 26, protectingmain body 30 from degradation due to exposure to sunlight, and also permitting adjacent bases to be securely fastened to one another so to keep them from separating and thus losing the benefits of being interengaged.Base cover 32 may be an electrically conductive sheet metal cover made of polyvinylidene fluoride (PVDF) resin-coated metal. PVDF resin is available from ATOFINA Chemicals, Inc of Philadelphia, Pa. as KYNAR® polyvinylidene fluoride (PVDF) resin. Alternatively,base cover 32 could be made of, for example, galvanized steel, steel, zinc-alum, or aluminum.Cover 32 may have an electrically insulating surface coat of, for example, PVDF resin, Noryl PPO, ASA 606 Acrylic paint by Colloid Research, Inc., or ceramic filled resin coatings by ICS Technologies or EP21LV epoxy by Master Bond Inc. Alternatively, cover 32 may be electrically non-conducting, such as Noryl PPO, ASA 606 Acrylic paint, ceramic filled resin, or other non-conducting material. The interengagement ofadjacent PV assemblies 14 is through the use of tongue and groove interengagementelements main body 30 of each base 26 and, alternatively, or in addition, by mechanically fastening covers 32 to one another using fasteners 38. One or moreradiant barriers PV module 24 andbase 26. The use of radiant barriers, typically low emissivity (low-e) films, is described in more detail in U.S. Pat. No. 6,061,978. The use of thermal insulation in conjunction with PV modules is described in the following U.S. Pat. Nos. 5,316,592; 5,505,788; 5,746,839; and 6,148,570. - A number of
vents 46 are formed inbase 26 to providepressure equalization paths 48 extending from theouter surface 50 ofPV module 24, past theperipheral edge 52 of the PV module, to and throughvents 46, and to thelower surface 54 ofbase 26. In FIGS. 3 and 4 there is anexaggerated gap 56 shown between thelower surface 54 ofbase 26 andsupport surface 16. Thus, when wind is moving overarray 12 and creates one or more low pressure regions above the one ormore PV assemblies 14, the differential pressure betweenouter surface 50 ofPV module 24 andlower surface 54 ofbase 26 can be at least partially equalized by the passage of air alongpaths 48. Thevents 46 includeperipheral vents 58, see FIG. 6, that are generally aligned or coincident withperipheral edge 52, andinterior vents 60.Peripheral vents 58 are located betweensupport assembly 28 and theouter edge 66 ofbase 26.Pressure equalization paths 48, passing throughperipheral vents 58, are unobstructed fromperipheral edge 52 to the vents. The pressure equalization paths extending throughinterior vents 60 have partially obstructed path portions fromperipheral edge 52 tovents 60 due to the locations of thevarious support elements vents 60 between the center 61 ofPV module 24 andsupport elements - The
inner surface 63 ofPV module 24 is separated from theupper surface 65 ofbase 26 by an average distance of about h.Peripheral edges 52 are separated by an average distance of about d. The d/h ratio is preferably about 0.1 to 6 and more preferably about 0.5 to 3. Distances h and d typically range from about 1.3 cm to 10 cm for h and about 1.3 cm to 7.6 cm for d, but may be greater or lesser than these distances. - There is a trade-off between the size and number of vents and the thermal insulation provided by
base 26. Assumeperipheral vents 58 for aPV assembly 14 have a total cross-sectional area of V andPV module 24 has a cross-sectional area of P. The percentage of V to P is (1) at least about 0.02 percent and preferably at least about 0.07 percent, and (2) about 0.02 percent to 50 percent, and preferably about 0.05 percent to 5 percent and more preferably about 0.07 percent to 2 percent. Forming vents in this manner aids the ability to use aPV assembly 14 having a weight of about 5-25 kg per square meter while avoiding the need to attachPV assembly 14 to supportsurface 16. In addition, if the total cross-sectioned area ofperipheral vents 58 is w, it is preferred that the percentage of w to P be about 0.1% to 50% and more preferably about 0.4% to 5%. The determination of the percentage of w to P involves balancing the desire to minimize the holes, as they require additional manufacturing steps and degrade the insulating quality of the foam layer, with the desire to maximize the holes to improve resistance to wind uplift. So the final decision as to the percentage of w to P will typically result in the determination of the minimum vent area needed to withstand uplift forces with comfortable safety margin. - FIG. 5 illustrates an alternative embodiment of a PV assembly67 in which
PV module 24 is mounted directly ontobase 68 using an adhesive as the support assembly; other support structures, such as fasteners or clips, or a combination of support structures, could be used as the support assembly.Base 68 is similar tobase 26 but includes nocover 32. Also,base 68 only hasperipheral vents 58 which lie generally coincident withperipheral edge 52 ofPV module 24. - FIGS. 8 and 9 illustrate
vents 70 formed at the intersectingouter edges 66 ofadjacent bases 26.Such vents 70 are also considered to be generally aligned with or coincident withperipheral edge 52 ofPV module 24. - FIGS. 10 and 1I1 illustrate a
PV assembly 72 using Z-type supports 74 secured toPV module 24 with an adhesive 76. Z-type supports 74 are preferably integral, one-piece extensions ofbase cover 32.Supports 74 may also be attached tobase cover 32. A low emissivity (low-e)film 78 is situated betweencover 32 andPV module 24. - FIG. 12 illustrates an alternative method of interengaging
adjacent bases 68 using 30fastener brackets 80 mounted to each base with the brackets secured together by a double-headedfastener 82, such as a nut and bolt or rivet. FIG. 13 illustrates another alternative in which base covers 32 are interengaged and electrically connected by anelectrical ground connection 84 between adjacent covers. A wide variety of interengagement elements and electrical ground connections, including rigid, flexible and elastic elements, may be used. - FIG. 14 illustrates supporting a
flexible PV panel 86 with aPV panel stiffener 88 to create a self-supporting, generallyrigid PV module 89. -
Perimeter assembly 20, see FIGS. 1 and 3, comprises a series ofperimeter elements 90. Typically, eachperimeter element 90 is the same length as one side of aPV assembly 14.Perimeter elements 90 are preferably secured to one another so thatperimeter assembly 28 is a belt-like perimeter assembly.Perimeter assembly 20 serves several functions including (1) maintaining the spatial integrity ofarray 12 by helping to preventPV assemblies 14 from shifting or otherwise moving laterally relative to one another, and (2) deflecting air away from the lateral edges ofarray 12. This latter function is aided by configuringperimeter elements 90 with a slopedouter surface 92 and providingperimeter elements 90 with anupper edge 94 which is about equal in elevation to or aboveouter surface 50 ofPV module 24. Perimeter elements typically weigh about 3-52 kg per linear meter, and more preferably about 18-30 kg per linear meter. - FIG. 15 illustrates an
alternative perimeter element 96 comprising aperimeter pan 98 having anouter lip 100 which is joined to abase portion 102. A generally v-shaped coupler 104 extends frombase portion 102 and may be fastened tobase 26 by afastener 106.Perimeter element 96 also includes aballast element 108, typically made from concrete, stone or other suitably heavy material. FIG. 16 illustrates aunitary perimeter element 110 which may be fastened tobase 26 by afastener 112.Perimeter element 110 is preferably a molded or cast material, such as concrete, or plastic. As shown in FIG. 17,perimeter elements 110 may be secured together using ball and socket type ofengagement members 114. - FIGS.18-20 illustrates a further embodiment of a perimeter assembly using
perimeter elements 116 similar toperimeter element 96 with the following differences. Acap 118 is used to coverballast element 120, the cap defining a sloped outer surface 122 and anupper edge 124 ofperimeter element 116. Acoupler 126 is a relatively simple L-shaped member and extends from apan 128. Thepans 128 ofadjacent perimeter elements 116, overlap, as shown in FIGS. 18 and 19, to help increase the structural rigidity betweenperimeter elements 116. FIGS. 18 and 20 also illustrate the use of cross strapping 130 betweenperimeter elements 116 on opposite sides of the array 132 ofPV assemblies 14. In this embodiment cross strapping 130 passes betweenPV module 24 andbase 26. It could, however, pass entirely beneathPV assembly 14, entirely above the PV assembly, or combination of above, below and through the PV assembly. Cross strapping 130 helps to maintain the desired shape of perimeter assembly 134 and thus of array 132 ofPV assemblies 14. Other cross-strapping arrangements, such as triangular, may also be used. - FIGS. 21 and 22 illustrates an
inclined PV assembly 138 comprising abase 140, aninclined PV module 142, and aninclined deflector 144; the PV module and deflector are mounted at first andsecond angles Angle 146 is typically about 5 degrees to 30 degrees whileangle 148 is typically about 20 degrees to 70 degrees. The opposedupper edges 152, 154 ofmodule 142 anddeflector 144 define agap 156 overlying a set ofvents 158 formed inbase 140.Gap 156 is typically about 2-8 cm wide.Edges 152, 154 are typically about the same distance abovebase 140. While it may be desirable to use additional vents throughbase 140 at different locations, it has been found through wind tunnel testing that positioning vents 158 to be generally aligned with or coincident withgap 156 and providing substantially unobstructed flow paths between the gap and the vents appears to be effective in substantially reducing wind uplift forces oninclined PV assembly 138. - FIG. 23 illustrates an alternative embodiment to the assembly shown in FIGS. 21 and 22 in which an
inclined PV assembly 160 useshollow conduits 162 tofluidly couple gap 156 and vents 158. An advantage of usinghollow conduits 162 by constraining the fluid pathway, more pressure at the top the gap is transferred directly to under the base. - FIGS. 24 and 25 illustrates a further alternative embodiment of an
inclined PV assembly 166 in which the support assembly is split up into a PVmodule support assembly 168 and adeflector support assembly 170. Adeflector 172 is formed by the outer surface ofdeflector support assembly 170.Support assemblies flow path 174 between agap 176 and a single, slot-like vent 178.Base 180 is an extended-width base to provide awalkway 182 adjacent todeflector 172. Within an array, all of the PV assemblies do not need to be designed with an extended-width base to provide awalkway 182. - FIGS. 26 and 27 illustrate an
inclined PV assembly 186 similar to the embodiment of FIGS. 24 and 25 but using a multiposition PVmodule support assembly 188 and a multipositiondeflector support assembly 190.Support assembly 188 comprises a hingedsupport 192 at one end ofPV module 142 and astrut 194 pivotally mounted nearupper edge 152 ofmodule 142.Assembly 188 also includes aclip 196 at the outer end ofstrut 194 and acomplementary clip 198 positioned adjacent to ahollow extension 200 of vent 178 (see FIG. 28). Thedeflector support assembly 190 includes similar support structure.Clips assembly 186 is in an inclined, in-use configuration of FIG. 27 to maintain the inclined configuration under wind loads. FIG. 28 showsPV module 142 anddeflector 144 in a shipping configuration at whichPV module 142 anddeflector 144 are generally parallel tobase 140 so thatangles module 142 in the shipping configuration of FIG. 28, ashipping block 202 is positioned betweenPV module 142 andbase 140; a similar support block may be used betweendeflector 144 andbase 140. Other means for stabilizing and supportingPV module 142 anddeflector 144 in either or both of the in-use and shipping configurations may be used. Also, strut 194 may be made to be adjustable in length so to varyfirst angle 146; this may require thatdeflector support assembly 190 be adjustable so to permit adjustment of thesecond angle 148. - FIGS. 29 and 30 illustrate the use of an end cap perimeter element204, similar to
perimeter element 96 of FIG. 15, including aballast element 206. The primary difference is thatcoupler element 96 is substantially enlarged to create anend cap coupler 208 sized to at least substantially cover the generally triangular opening created by the upwardly extendingedges PV module 142 anddeflector 144. FIG. 31 illustrates aperimeter element 214 similar to the perimeter element of FIGS. 29 and 30.Perimeter element 214 includes asloped end cap 216, similar to that shown in FIGS. 19 and 20, and a tongue andgroove interengagement region 218 for interengagement withbase 140.Perimeter elements 204, 214 provide end caps for angled PV assemblies; end caps may also be provided separate from the perimeter elements. - FIG. 32 is a top plan view illustrating an
array 220 ofPV assemblies 222. The PV assemblies illustrated are conventional assemblies available from PowerLight Corporation of Berkeley, Calif. as PowerGuard® and are similar toPV assemblies 14 of FIG. 3.Array 220 is supported by acorrugated roof 224, having alternatingridges 226 andtroughs 228, and thermally insulating support blocking 230 withintroughs 228.Array 220 is surrounded by aperimeter assembly 232, shown in more detail in FIGS. 34-38.Perimeter assembly 232 comprises mountingelements 234 mounted toridges 226 ofroof 224 using conventionalcorrugated roof fasteners 236 which pass throughbase 238 of mountingelement 234. Mountingelement 234 includes anupstanding portion 240 having asupport tab 242 at its upper end and a laterally extendingsecurement clip 244 betweenbase 238 andsupport tab 242. Theclip 244 engages theupper surface 246 of thebase 248 ofPV assembly 222 to help securePV assembly 222, and thusarray 220, toroof 224.Base 248 is of conventional construction withupper surface 246 of a cementitious material covering an expanded polystyrenemain body 249. - An L-shaped
wind baffle member 250 is secured tobases 238 of mountingelements 234 and has a series of downwardly extending wind baffles 252 sized and shaped to fill substantial portions oftroughs 228 beneathperimeter assembly 232.Perimeter assembly 232 also includes acover 254 extending betweensupport tabs 242 and bases 238. Cover 254 has a slopedouter surface 256.Perimeter assembly 232 has anupper edge 258 that is generally even with or vertically above theouter surface 260 of thePV module 262 ofPV assembly 222. FIGS. 37-39show mounting elements 264; mountingelements 264 are modified from mountingelements 234 to accommodatepositioning perimeter assembly 232 along the sides ofarray 220 that run parallel totroughs 228. The main difference is thatbase 266 of mountingelement 264 is much longer and extends to both sides ofupstanding portion 240. - FIGS. 40 and 41 illustrate a standing
seam roofing system 268 having standing seam orridge portions 270 and pan ortrough portions 272.Trough portions 272 are effectively filled with blocks of thermally insulatingsupport foam 274 to both provide thermal insulation forroofing system 268 and support an array ofPV assemblies 222 and a walkway-type ofperimeter assembly 276.Perimeter assembly 276 includes apaver 278 made similarly tobase 248 to provide a walkway around the array ofPV assemblies 222. L-shapedflashing 280 engages the outerperipheral edge 282 ofpaver 278 and is secured to standingseam portions 270 bybrackets 284, such as available from Hougovens Aluminum Bausysteme GmbH of Koblenz, Germany as Kal-Zip brackets. Asloped cover 286 is mounted along theedge 288 ofpaver 278 to lie adjacent toassemblies 222.Sloped cover 286 has anupper edge 290 positioned at least about even with or aboveouter surface 268 ofPV module 262. - The embodiments of the FIGS.33-41 show the use of insulating foam blocking within the troughs of the building surface. Other types of material, preferably thermally insulating material, can be used, such as polyurethane-based spray foam insulation.
- In use, vents are formed through
base 26 to create one or morepressure equalization paths 48 extending fromouter surface 50 ofPV module 24, pastperipheral edge 52, to and through at least one of the vents, and tolower surface 54 of the base. At least some ofvents 46 may be positioned to be generally aligned or coincident withperipheral edge 52.Pressure equalization path 48 may be created so that the portion of the path extending fromperipheral edge 52 to avent 46 is an unobstructed path portion. See, for example, FIGS. 4, 9, 21 and 24. As shown in FIGS. 21-31,PV module 142 may be oriented at anangle 146 to thebase 140 and adeflector 144 may be mounted at anangle 148 to the base, the module and deflector havingupper edges 152, 154 defining agap 156 therebetween. At least onehollow conduit 162 may be used tofluidly couple gap 156 and vent 158. An array of the PV assemblies is mounted to a support surface, typically a horizontal roof; sloped support surfaces may also be used. Mounting typically can be accomplished without the need for fasteners to attach to PV assemblies to the support surface even though the weight of the PV assemblies is in the range of about 10 kg per square meter to 40 kg per square meter and preferably in the range of about 15 kg per square meter to 25 kg per square meter. This is possible, as discussed above, by the of pressure-equalization created through the use of vents and pressure equalization flow paths, and by the use of a perimeter assembly to help maintain the interengagement of the PV assemblies and help deflect wind away from the edges of the array. If desired, support surface-penetrating fasteners or adhesives, or a combination thereof, may be used. - The mounting procedure varies somewhat when an array of PV assemblies is mounted to a support surface comprising alternating ridges and troughs. The troughs beneath the perimeter of the array of PV assemblies will typically be filled with wind deflectors. Thermal insulation is preferably placed in the troughs beneath the array for thermal insulation and to help support the array; however, the location of the thermal insulation may be limited to the perimeter portions of the array, such as the first meter in from all edges. At least one of the vents may be positioned at a location between the center of the PV module and the support assembly for each of a plurality of the PV modules.
- Modification and variation can be made to the disclosed embodiments without departing from the subject of the invention as defined in the following claims.
- Any and all patents, applications, and printed publications referred to above are incorporated by reference.
Claims (36)
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Also Published As
Publication number | Publication date |
---|---|
EP1412988A4 (en) | 2008-01-02 |
JP4369226B2 (en) | 2009-11-18 |
JP2013057239A (en) | 2013-03-28 |
JP5260423B2 (en) | 2013-08-14 |
EP1412988A1 (en) | 2004-04-28 |
US6809253B2 (en) | 2004-10-26 |
WO2003007388A1 (en) | 2003-01-23 |
US6570084B2 (en) | 2003-05-27 |
US20030010375A1 (en) | 2003-01-16 |
JP2013191880A (en) | 2013-09-26 |
JP2009224807A (en) | 2009-10-01 |
ES2367867T3 (en) | 2011-11-10 |
JP5480426B2 (en) | 2014-04-23 |
ATE522935T1 (en) | 2011-09-15 |
EP1412988B1 (en) | 2011-08-31 |
JP2004535678A (en) | 2004-11-25 |
JP5385447B2 (en) | 2014-01-08 |
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